Circuit Description

IPC receives a vehicle speed input from Vehicle Speed Sensor (VSS) to drive speedometer/odometer over the Class 2 serial data line. IPC compares data from VSS with a 16-point look-up table to determine needle deflection. A smooth filter is used to allow continuous response.

Season odometer displays total accumulated mileage of vehicle, which is permanently stored in the IPC EEPROM. Trip odometer displays accumulated mileage (in tenths of miles) since last reset. This information is stored in the instrument panel Keep Alive Memory (KAM).

DTC will set when IPC detects an internal fault to speedometer/odometer which is not caused by an external source. When DTC B0570 is set, odometer will display ERROR.

Under all fault conditions, a current DTC requires an ignition cycle to become a history code. If conditions for malfunction no longer exist, history DTC will clear after 100 consecutive ignition cycles. DTC will also clear when scan tool is used to clear codes.